uds/ASDS.dcl

   1 definition module ASDS
   2
   3 from Data.Functor import class Functor
   4 from Control.Applicative import class Applicative, class <*>, class pure
   5 from Control.Monad import class Monad
   6 from Control.Monad.State import :: StateT
   7
   8 import ASDS.Source
   9 import ASDS.Parallel
  10 import ASDS.Select
  11 import ASDS.Lens
  12
  13 :: PViewT m a :== StateT [NRequest m] m a
  14 :: NRequest m = NRequest String (m ()) Dynamic
  15
  16 //* Read a share with one rewrite step
  17 class read v :: (v m p r w) p -> PViewT m (ReadResult m p r w) | Monad m
  18 //* Write a share with one rewrite step
  19 class write v :: (v m p r w) p w -> PViewT m (WriteResult m p r w) | Monad m
  20 //* Observe a share and get notified when it happens
  21 class observe v
  22 where
  23         identity :: (v m p r w) [String] -> [String]
  24         observe :: (v m p r w) p String (m ()) -> PViewT m () | Monad m & TC p
  25
  26 //* Result of a single read rewrite
  27 :: ReadResult m p r w
  28         = Read r //* done reading
  29         | E.sds: Reading (sds m p r w) & read sds //* not done reading
  30         | ReadResultUnused (m ())
  31
  32 //* Result of a single write rewrite
  33 :: WriteResult m p r w
  34         = Written () //* done writing
  35         | E.sds: Writing (sds m p r w) & write sds //* not done writing
  36         | WriteResultUnused (m ())
  37
  38 //* Read lens, it can choose to ignore the source
  39 :: LensRead m p r rs
  40         = LensRead (p rs -> m r)
  41         | LensReadConst (p -> m r)
  42
  43 //* Write lens, it can choose to ignore the source, and thus not read it
  44 :: LensWrite m p w rs ws
  45         = LensWrite (p w rs -> m (? ws))
  46         | LensWriteConst (p w -> m (? ws))
  47
  48 //* Box type, to get rid of a possible complex constructor of combinators
  49 :: SDS m p r w = E.sds: SDS (sds m p r w) (m ()) /*force kind*/ & read, write, observe sds
  50 sds :: (sds m p r w) -> SDS m p r w | read, write, observe sds & Monad m
  51
  52 instance read SDS
  53 instance write SDS
  54 instance observe SDS
  55
  56 //* Read a share completely
  57 getShare :: (sds m () r w) -> PViewT m r | Monad m & read sds & TC r & TC w
  58
  59 //* Write a share completely
  60 setShare :: w (sds m () r w) -> PViewT m () | Monad m & write sds & TC r & TC w
  61
  62 //* Update a share completely
  63 updShare :: (r -> w) (sds m () r w) -> PViewT m w | Monad m & read sds & write sds & TC r & TC w